Transcript

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>> A deeper chill between Turkey and the United States. Prosecutors in Istanbul reportedly sending a formal letter to Washington, demanding the detention of this man, Fethullah Gulen, alleged by Turkish authorities to be the mastermind of July's failed coup attempt. The latest in a string of such requests for Gulen, the Islamic cleric living in self-imposed exile at this estate in rural Pennsylvania.

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Gulen is the head of a Turkish popular movement. And his followers have established a massive network of business and secular schools outside of Turkey, including in the United States.>>

FOREIGN]

> But Turkish President Erdogan has accused his former ally of running a shadowy cabal inside his government.

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Since the coup attempt, Erdogan has purged thousands of government workers, including judges, members of the military, and teachers. He accuses them all of being Gulen followers. He's also encouraging a very public warming of relations between Russia and Turkey, a NATO member. Gulen has condemned and denied the coup.

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Washington says it will not extradite the man without proof of his involvement.